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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da10df4463449497fdfb7407ce894700212f61900c2a043b22cf25d7471be0d6' 
  AND token = 'Fmm3AcICWe5AOLgb/8AKdfAoZ00vR1R+H392qSKQGWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}